Update pyproject.toml

Author: chalmerlowe

pyproject.toml

@@ -19,7 +19,7 @@ build-backend = "setuptools.build_meta"
 [project]
 name = "google-cloud-bigquery"
 authors = [{ name = "Google LLC", email = "[email protected]" }]
-license = { text = "Apache-2.0" }
+license = "Apache-2.0"
 license-files = ["LICENSE"]
 requires-python = ">=3.9"
 description = "Google BigQuery API client library"